Monthly Notices of the Royal Astronomical Society
We present a statistical analysis of the millimetre-wavelength properties of 1.4 GHz-selected sources and a detection of the Sunyaev-Zel'dovich (SZ) effect associated with the haloes that host them. We stack data at 148, 218 and 277 GHz from the Atacama Cosmology Telescope at the positions of a large sample of radio AGN selected at 1.4 GHz. The thermal SZ effect associated with the haloes that host the AGN is detected at the 5 sigma level through its spectral signature, representing a statistical detection of the SZ effect in some of the lowest mass haloes (average M-200 approximate to 10(13) M-circle dot h(70)(-1)) studied to date. The relation between the SZ effect and mass (based on weak lensing measurements of radio galaxies) is consistent with that measured by Planck for local bright galaxies. In the context of galaxy evolution models, this study confirms that galaxies with radio AGN also typically support hot gaseous haloes. Adding Herschel observations allows us to show that the SZ signal is not significantly contaminated by dust emission. Finally, we analyse the contribution of radio sources to the angular power spectrum of the cosmic microwave background.
Faculty Start Year
Megan B. Gralla, Devin Crichton, Tobias A. Marriage, Wenli Mo, Paula Aguirre, Graeme E. Addison, V. Asboth, Nick Battaglia, James Bock, J. Richard Bond, Mark J. Devlin, Rolando Dunner, Amir Hajian, Mark Halpern, Matt Hilton, Adam D. Hincks, Renee A. Hlozek, Kevin M. Huffenberger, John P. Hughes, R. J. Ivison, Arthur Kosowsky, Yen-Ting Lin, Danica Marsden, Felipe Menanteau, Kavilan Moodley, Gustavo Morales, Michael D. Niemack, Seb Oliver, Lyman A. Page, Bruce Partridge, Erik D. Reese, Felipe Rojas, Neelima Sehgal, Jon Sievers, Cristobal Sifon, David N. Spergel, Suzanne T. Staggs, Eric R. Switzer, Marco P. Viero, Edward J. Wollack, and Michael B. Zemcov. MNRAS 445(1):460–478. 2014.